JP3100715B2 - Lubrication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lubrication method.

[0002]

2. Description of the Related Art Known lubrication methods for lubricating bearings using a low-viscosity lubricating oil include a drop lubrication method, a mist lubrication method, an oil air lubrication method and an oil jet lubrication method. These will be described with reference to FIGS.

As shown in FIG. 6, the drop lubrication method includes a shaft 6 rotatably supported by a bearing 4 through a hole 5 formed in the bearing 4 through a guide pipe 3 through a lubricating oil 2 in an oil reservoir 1. It is a method of dropping and refueling. Further, as shown in FIG. 7, the mist lubrication method uses the negative pressure generated when the compressed air flowing into the suction pipe section 7 passes through the venturi section 8 to cause the lubricating oil 2 in the oil reservoir 1 to flow from the suction pipe 9. This is a method in which the lubricating oil 2 is atomized by compressed air in the suction and venturi section 8 and supplied to the bearing from the discharge pipe section 10.

In the oil air lubrication method, as shown in FIG. 8, a lubricating oil supply port 12 is provided in the middle of a pipe 11, and compressed air is supplied from an upstream side of the pipe 11 (left side in FIG. 8). The lubricating oil 2 is sucked out from the lubricating oil supply port 12 and
This is a method of discharging to the downstream side of No. 1 and supplying oil to the bearing. Further, as shown in FIG. 9, the oil jet lubrication method includes a nozzle member 1 through a passage 14 formed in a housing 13.
This is a method of injecting and supplying lubricating oil from the nozzle 16 formed on the bearing 5 to the bearing 4.

[0005]

However, in the above-mentioned conventional lubrication method, the drop lubrication method is limited to a downward lubricating oil supply direction due to gravity drop, and requires lubrication from the axial direction of the bearing. It is difficult to use for rolling bearings, and there is a problem with bearing temperature rise due to intermittent lubrication.The mist lubrication method is to carry mist in the air flow where the mist is to be lubricated. The probability of adhering is low, and mist easily adheres to the inner wall of the conduit in the middle, especially to the curved pipe portion. Therefore, the mist adhering to the inner wall becomes oil droplets and scatters to a place where lubrication is desired. Is very large than the mist, resulting in large lubrication, and there is a problem in the bearings such as acceleration of heat generation and increase in frictional force due to resistance to oil agitation.

Further, the oil-air lubrication method has a problem that oil droplets are often generated in a pipe, especially in a curved pipe portion or a step portion, and the frictional force increases, as in the above-mentioned mist lubrication method. Further, in the oil jet lubrication method, the lubricating oil often scatters to the opposite side of the nozzle between the balls of the bearing, and there is a problem in that the temperature of the bearing rises.

That is, all of the above lubrication methods have problems such as poor adhesion of mist in lubrication, an increase in bearing temperature, and a large mechanical loss.

In view of the foregoing, the present invention has been made to provide a lubricating method capable of greatly improving lubrication performance by supplying atomized lubricating oil in an ionized state at a high voltage. It is.

[0009]

According to the present invention, there is provided a lubricating method for supplying a lubricating oil atomized by an atomizing device to an object to be lubricated. A high voltage is applied to the high-voltage power supply to cause ionization or discharge between the anode and the cathode, and the atomized lubricating oil is ionized or ionized by the discharge to form a lubricated oil on the lubricated body. The lubrication method according to claim 1, wherein the anode of the high-voltage power supply is an object to be lubricated, and the cathode is an electrode member provided near a nozzle of the atomizing device. Wherein the anode of the high-voltage power supply is an electrode member provided downstream of the lubricating oil suction pipe of the atomizer, and the cathode is the lubricating oil suction pipe. The lubrication method according to claim 1 and claim 3 Is shall.

[0010]

A high voltage is applied between an anode and a cathode of a high voltage power supply. Then, ionization or discharge occurs between the anode and the cathode. Then, the atomized lubricating oil is supplied to the lubricated body in an ionized state by ionization or discharge phenomenon, and the mist of the ionized lubricating oil adheres to the lubricated body, and the temperature rise of the bearing is low and the mechanical loss is small. Perform lubrication.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ionization lubricating apparatus for carrying out the method of the present invention will be described below with reference to FIG.

The ionizing lubrication device 17 comprises an atomizing device 18
And an ionization device 19. Atomizer 18
Comprises an air compressor 20, a filter 21, a pressure regulator 22, and a mist producing device 23 from the air compressor 20 to the downstream side. The mist producing device 23 is provided with an oil sump 1 and an oil sump 1. A suction pipe 9 provided inside and having an inverted J-shape, and the suction pipe 9 is opened to the venturi section 8. Further, an L-shaped nozzle 16 whose tip is directed to the rolling element 24 of the bearing 4 is provided on the housing 13 in which the bearing 4 as the lubricated body is fitted via an insulator 13a. The nozzle 16 and the upper part of the oil reservoir 1 are connected by a pipe member 25. The ionization device 19 has an electrode member 26 inserted through the nozzle 16 and a high-voltage power supply 27. The anode side of the high-voltage power supply 27 is connected to the housing 13, and the cathode side is connected to the electrode member 26. . In addition, 6 has shown the axis | shaft.

When the air compressor 20 is driven, the compressed air passes through the filter 21 and the pressure regulator 22 to enter the mist producing device 23 and is sucked up from the suction pipe 9 because the ionizing lubricating device 17 is configured as described above. By blowing the lubricating oil 2 blown off, an oil mist 28 is formed. The oil mist 28 passes through the pipe member 25 and passes through the nozzle 16.
From the bearing 4. Then, when a high voltage is applied by the high voltage power supply 27, ionization or discharge is started between the bearing 4 on the anode side and the electrode member 26 on the cathode side. Here, when the voltage of the high voltage power supply 27 is adjusted to an ionization voltage, the oil mist 28 is ionized and
Supplied to

In this embodiment, the electrode member 26 is inserted through the nozzle 16. However, as shown in FIG. 2, the electrode member 26 and the nozzle 16 may be disposed separately. However, since the inner ring 29 of the bearing 4 and the rolling element 24 rotate with the rotation of the shaft 6, the atomized oil mist 28
Can reach the electrode member 26 and be ionized, so that the oil mist 28 in an ionized state is supplied to the bearing 4.

Next, another embodiment of the ionization lubricating apparatus for carrying out the method of the present invention will be described with reference to FIG. 3, omitting the same components as those of the above-described embodiment.

The ionizer 19a is a mist producing unit 23.
, An electrode member 26, and a high-voltage power supply 27.

The mist producing device 23 is box-shaped and has an oil reservoir 1 therein, a venturi section 8 formed above the oil reservoir 1, and an inverted J-shape provided inside the oil reservoir 1. And a suction pipe 9 whose tip is located in the venturi section 8. A ring-shaped electrode member 26 is fitted in the opening 30 on the downstream side of the venturi section 8. The opening 30 is provided with a partition plate 32 having a communication portion 31 at a lower portion downward, and the partition plate 32 forms a mist chamber 33 on the downstream side inside the oil reservoir 1. In addition, the housing 13 into which the bearing 4 is fitted
The nozzle 1 is made of an electrically insulating material such as plastic and formed in an L-shape with its tip facing the rolling element 24 of the bearing 4.
The nozzle 16 and the upper part of the oil reservoir 1 are connected by a pipe member 25 made of an electrically insulating material such as plastic.

The high-voltage power supply 27 has a main power supply 34 and an auxiliary power supply 35. The cathode side of the main power supply 34 is connected to the suction tube 9, and the anode side of the main power supply 34 is connected to the electrode member 26. Have been. The auxiliary power supply 35 is connected in series to the main power supply 34, and the anode side is connected to the housing 13 of the bearing 4.

In this embodiment, the ionizing lubrication device 17 is used.
Is configured in this way, when the air compressor 20 is driven, the compressed air passes through the filter 21 and the pressure regulator 22 and the venturi portion 8 of the mist producing device 23
And the lubricating oil 2 is sucked up from the suction pipe 9
8 are formed. Since the oil mist 28 is blown to the opening 30 side of the venturi section 8, if a high voltage is applied by the main power supply 34 of the high-voltage power supply 27, ionization or fine ionization occurs between the suction pipe 9 and the electrode member 26. Corona discharge occurs, and the oil mist 28 is ionized. Then, the ionized oil mist 28 is supplied to the mist chamber 33.
And is injected from the nozzle 16 toward the bearing 4 through the piping material 25. Further, the mist lubricating oil 2 which is not ionized in the mist producing device 23 or has a large particle diameter is condensed and liquefied in the mist chamber 33 and is combined with the lubricating oil 2 in the oil reservoir 1. When a high voltage of 0 or more is applied to the auxiliary power supply 35 between the electrode member 26 and the housing 13, the bearing 4 becomes the same polarity as the electrode member 26, and the supply of the oil mist 28 to the bearing 4 is performed. Accelerated.

In this embodiment, the pipe 25 is made of an electrically insulating material such as plastic so that the oil mist 28 loses electric charge in the pipe 25 and does not condense similarly to mist lubrication. A voltage may be applied by providing a power source so that the 9 and the pipe member 25 have the same potential, and the lubricated body is a rolling bearing, but may be a sliding bearing, but is not limited thereto.

FIG. 4 shows a case where the lubrication method of the present invention is applied to a sliding surface 36 of a machine tool. That is, the high-voltage power supply 27 is provided between the injector 37 and the sliding surface 36 to be electrically connected, and the oil mist 28 injected from the injector 37 is ionized, so that the ionized oil is applied to the sliding surface 36. Due to the fog, the adsorption is strong and the wettability is good, so that a uniform oil film is formed, which is effective in preventing the sliding surface 36 from galling and stick-slip. Then, as shown in FIG. 5, in order to supply the ionized oil mist 28 to the sliding surface 36 at a distant place, the ring-shaped electrode member 26 is placed at a distance where ionization of the nozzle 16 or fine corona discharge is possible. By providing the sliding surface 36 with the same potential or a high potential with respect to the electrode member 26, a more uniform oil film can be formed.

Further, the lubrication method of the present invention can be applied to lubrication of gear tooth surfaces and the like. Here, the effects of the embodiment by the above-described ionization of the oil mist, that is, an increase in the adhesive force, a reduction in heat generation, and a reduction in the frictional force will be described.

Since a lubricating oil is a dielectric material, when a high voltage is applied to the oil mist, ionization or fine corona discharge occurs, electrons collide with the surface of the oil mist, and a highly polar functional group is generated on the surface of the oil mist, thereby activating the oil mist. To improve the wettability of the lubricating oil and improve its binding force with other molecules.
Adhesion increases due to forced adhesion by the electric force of ions. Then, the oil mist adheres to the rolling elements of the bearing and spreads, so that the oil film becomes thin, so that the heat generated by stirring the lubricating oil is reduced. here,
The reason for the increase in the adhesive force will be described with reference to FIGS.

In normal lubrication, as shown in FIG. 10, an oil film 38 has a bubble 40 interposed between it and a member 39 to be lubricated. Therefore, the oil film 38 and the lubricated member 39
The area of the contact portion 41 is small, and the oil film 38 is easily broken. However, when lubrication is performed with the ionized mist, the particles of the ionized mist are accelerated by the electric field and collide with the surface of the lubricated member 39. As shown in FIG. 11, the bubble 40 between the oil film 38 and the lubricated member 39 to be lubricated is reduced, and the area of the contact portion 41 between the oil film 38 and the lubricated member 39 is increased, so that the oil film 38 is broken. Seems difficult.

It is considered that the cooling effect is realized as follows.

When corona discharge is performed on the oil mist, gas molecules around the oil mist are also ionized and are attracted toward other electrodes in the same manner as the oil mist. In this process, gas moves with the movement of the oil mist, and wind is generated. This wind is called an ion wind and has a speed of several m / s or more, so that the cooling effect is sufficient and the heat generation of the bearing is reduced.

[0027]

As described above, in the lubrication method according to the present invention, the high voltage is applied between the anode and the cathode of the high voltage power supply to cause ionization or discharge phenomenon, and the atomized lubricating oil is ionized. Or, since it is supplied to the lubricated body in an ionized state by a discharge phenomenon, the polarity of the surface of the atomized lubricating oil is increased, the adhesion of the lubricating oil to the lubricated body is increased, and the oil film breakage is improved, Galling is eliminated.

Further, since the atomized lubricating oil spreads on the surface of the object to be lubricated, the oil film becomes thin and the heat generated by stirring the lubricating oil is reduced. Further, in the event of ionization or discharge, the atomized lubricating oil is sucked toward another electrode, and the lubricated body is cooled by the ionic wind caused by this movement. These have excellent effects such that the purpose can be achieved by an inexpensive device.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing one embodiment of an ionization lubrication device using a lubrication method of the present invention.

FIG. 2 is a vertical cross-sectional view in a direction perpendicular to an axis of the ionization lubrication apparatus, showing a state in which an electrode member and a nozzle are disposed apart from each other.

FIG. 3 is a partial longitudinal sectional view showing another embodiment of the ionization lubrication device using the lubrication method of the present invention.

FIG. 4 is a perspective view when the lubrication method of the present invention is used for a sliding surface of a machine tool.

FIG. 5 is a perspective view when the lubrication method of the present invention is used for a sliding surface of a machine tool.

FIG. 6 is an explanatory view of a conventional dripping lubrication method.

FIG. 7 is an explanatory view of a conventional mist lubrication method.

FIG. 8 is an explanatory diagram of a conventional oil-air lubrication method.

FIG. 9 is an explanatory view of a conventional oil jet lubrication method.

FIG. 10 is an explanatory view showing a state of a conventional adhesive force for explaining an increase in the adhesive force of the lubrication method of the present invention.

FIG. 11 is an explanatory diagram for explaining an increase in adhesive force of the lubrication method of the present invention.

[Explanation of symbols]

 17 Ionization lubrication device 18 Atomization device 19 Ionization device 19a Ionization device 23 Mist manufacturing device 26 Electrode member 27 High voltage power supply

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16N ⁷ /32-7/34 B23Q 11/12

Claims (3)

(57) [Claims] 1. A lubricating method for supplying lubricating oil atomized by an atomizing device to a body to be lubricated, wherein a high voltage power source is provided in the atomizing device, and a high voltage is applied to the high voltage power source to form a positive electrode and a negative electrode. A lubrication method, wherein an ionization or discharge phenomenon occurs between the cathode and a cathode, and the atomized lubricating oil is supplied to the lubricated body in an ionized state by the ionization or discharge phenomenon. 2. The lubrication method according to claim 1, wherein the anode of the high-voltage power supply is an object to be lubricated, and the cathode is an electrode member provided near a nozzle of the atomizing device. 3. The lubricating oil suction pipe according to claim 1, wherein the anode of the high voltage power supply is an electrode member provided downstream of the lubricating oil suction pipe of the atomizing device, and the cathode is the lubricating oil suction pipe. Lubrication method.